User Manual

4 GMC-I Messtechnik GmbH
2.3 Initial Start-Up
After inserting the batteries in accordance with section 5.1 on
page 9, the measuring instrument is ready for operation.
3 Performing Measurements
3.1 Switching the Instrument On and Off
The instrument is switched on by pressing and holding the START
key. Briefly press the START key twice in order to switch the
instrument off, during which no voltage may be applied to the test
probes! The instrument is switched to the standby mode after
several seconds (reduced brightness), if none of the keys has
been pressed and no voltage is applied to the test probes. The
instrument is switched out of the standby mode (i.e. back to full
brightness) by pressing any key or applying voltage to the test
probes. The instrument is shutdown automatically if it has
remained inactive for about 1 minute, i.e. if no keys have been
pressed and no voltage has been applied to the test probes dur-
ing this time.
3.2 Instructions and Principles with Validity for
All Measurements
Setting Parameters
The desired functions or parameters are selected with the FUNC,
IN, TYPE and xIN keys (see section 3.3). Measurement is trig-
gered by pressing the START key. All selected functions or param-
eters remain valid until they are changed.
Interference Voltage
If (interference) voltage of less than 190 V or greater than 255 V is
applied to the test probes, corresponding information appears at
the display. If this is the case, the START key is disabled.
Blown Fuse
If line voltage is applied to the test probes, and if the fuse is either
blown or has not been inserted, this is indicated at the display.
Figure 3.3: Blown Fuse Display
The fuse must be replaced as described in section 5.1.3.
Note
If a voltage within a range of 25 to 190 V is applied to the
test probes, the blown fuse symbol is also displayed at
the instrument even if the fuse is OK. For this reason,
make sure that voltage in the measured electrical circuit is
really less than 190 V before replacing the fuse.
Prerequisites for RCD Measurement
• If a voltage within a range of 190 to 255 V is applied to the test
probes, the TRMS value appears at the display and measure-
ment can be triggered by pressing the START key.
Figure 3.4: Example of a Voltage Measurement
• For safety reasons, the test instrument first determines
whether or not touch voltage Uc is higher than the selected
limit value each time the START key is pressed before measur-
ing RCD parameters. If the limit value is exceeded, this is indi-
cated at the display and the measurement is ended.
Tripping During Touch Voltage Measurement
If the display shown in figure 3.7 appears after pressing the START
key, the RCD has been tripped during touch voltage measure-
ment. This can be caused by an incorrectly adjusted nominal cur-
rent value IN, by a defective RCD or by previously existing leak-
age current via the RCD. This status is displayed until one of the
function selection keys is pressed, or the device is once again
connected to mains power.
Figure 3.7: Example of Display for Tripping During Touch
Voltage Measurement
Low Battery Voltage
If battery voltage is too low (only the red field is lit up in the battery
symbol), measurement cannot be triggered with the START key. If
the key is nevertheless pressed, the depleted battery symbol is
displayed for about 1 second. The instrument is then returned to
its previous status. Replace the batteries with new ones or
recharge them as described in section 5.1.
Figure 3.1: Display of (Inter-
ference) Voltage
<190V
Figure 3.2: Display of (Inter-
ference) Voltage
> 255 V
Figure 3.5: Touch Voltage
>50V
Figure 3.6: Touch Voltage
>25V
Figure 3.8: Battery Voltage
Too Low
Figure 3.9: Battery Status
After Pressing the
START Key